Improved tool-rest for lathes



tanned einer Y JAMES e. sToWE, or PROVIDENCE, RHODE ISLAND.

L Letfers'Pcm No. 97,723, dated December 7, 1869.

IMPROVE!) Toon-REST FOR LATHES.

Y The Schedule referred to in these Letters Patent and making part ofthe same.'

I, JAMES G. STOWE, ofthe cityand county of' Providence,'and State ofRhode ,Isla-nd, have` invented an Improvement in Lathes, of whichthelfollowingis a specification'. v 1` l f llo-enable those skilled inthe art gto make and use my invention, I will proceed to describe itsconstructionend operation.

Figure 1, ofthe accompanying drawings, 4represents ail-exteriorperspective -view ofniy invention, A being thepoppet-block, B thetoolrest`,-and I, a set screw.

Figure 2 shows `the construction'and adjustment ofthe `helical dam-block@loog-,wheel b, and cog-rack, e, `intlneiir. relative positions`wheu thepoppet-block A is at the lowest point of depression.

.Figure 3 shows the relative positions of the same when the poppet-blockA"is"at the highest point of elevation.

4Figure 4 is a perspective `view of the helical cambloc-k C, exhibitingthe two coin-'surfaces, the cog-rack c, andthe slots through which thescrews d d, of fig.

" 5, pass in screwing the cams to the poppet-bloc-k.,

e lFigure 5 isa sectional view of thc helical cem-block, showing itsslots and the positions and Working of the depressing screws ddtherewith.

When the poppet-block A is 'at its lowest point of depression, byturningthe cogfwheel b, its teeth are engaged in the cog-rack e, and revolvethe cam-block O, which raises the poppet-block A;

When the poppet-block A is nt any point above the lowest point ofdepression, by the reverse movement of the cog-Wheel b, theV cam-block Gis revolved backward, and the heads of. the screws d d traversing thewidened or conntersunk portionsof the slots in the Witnessesi HomericAA. HUNT, JOHN A. GARDNER.

